<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8" />
</head>
<body>
<h1>欢迎${user.username}<h1>
	<form action="${contextPath}/user/update/${userId}" method="post" >
		  <!-- 接受user的id值 -->
		修改用户名：<input type="text" name="updatename"/>
		<input type="submit"/>
	</form>
</body>
</html>